有些用COOK的D统计量大于0.5；DFFITS大于2作为判别标准

Cook's D值大于4/(n-k-1)，则表明是强影响点，其中n为样本量大小，k是预测变量数目。
R中还可以通过avPlots函数绘制变量添加图反映强影响点对模型的影响。

多谢！

您好，有具体的参考文献么，谢谢

可以阅读下面的参考文献

References

Belsley, D. A., Kuh, E. and Welsch, R. E. (1980). Regression Diagnostics. New York: Wiley.

Cook, R. D. and Weisberg, S. (1982). Residuals and Influence in Regression. London: Chapman and Hall.

Williams, D. A. (1987). Generalized linear model diagnostics using the deviance and single case deletions. Applied Statistics, 36, 181–191. doi: 10.2307/2347550.

Fox, J. (1997). Applied Regression, Linear Models, and Related Methods. Sage.

Fox, J. (2002) An R and S-Plus Companion to Applied Regression. Sage Publ.

Fox, J. and Weisberg, S. (2011). An R Companion to Applied Regression, second edition. Sage Publ; http://socserv.socsci.mcmaster.ca/jfox/Books/Companion/.